* Adding information on QA SDLC Delivery Model node
* Update content/roadmaps/113-qa/content/101-qa-sdlc/readme.md
* Tweaking files in the Chrome Dev Tools section - JS roadmap
* Tweaking format on files from Memory Management - JS roadmap
* Fixed issue with one of the Free Contents - CommonJS readme
* Format tweak on Callback nodes - JS Roadmap
* Format tweaks on different files from the Expressions and Operators tree
Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>